Abstract
Zingiber spectabile is a tropical ornamental species with difficulties to obtain efficient propagation system. Thus, this study aimed to assess the in vitro propagation of Zingiber spectabile. Seed characterization was determined by measuring length, width and thickness, the weight of 1000 seeds and imbibition curve. In vitro germination of seeds was at constant (25 °C) or alternating temperatures (20-30 ºC). For optimization of in vitro multiplication, different concentrations of activated charcoal (0.0, 0.1 and 0.3%) and sucrose (0.0, 0.1, 0.3, 0.5 and 0.7 M) were evaluated. Plantlets were inoculated in flasks with different sealing systems (PVC covers with or without filters at the center) and culture media (MS or WPM). The plants were acclimatized in Plantmax® substrate. Seeds were of 6.06 mm length, 3.22 mm wide and 2.83 mm thick. The weight of 1,000 seeds corresponded to 46.4 g. The seed imbibition curve approaches to a tree phase pattern. Alternating temperatures induced high germination rates (68%). The addition of 0.3% activated charcoal provided higher root growth and plants with smaller number of senescent leaves. The best plant growth was obtained by the use of 0.1 M sucrose. All acclimatized plants survived (100%). The results demonstrate that Z. spectabile respond well to in vitro propagation.
Highlights
As an attractive tropical ornamental plant, Zingiber spectabile (Zingiberaceae) is widely cultivated in Brazil due its high commercial value. This species is known as beehive ginger or ornamental ginger, and is used for landscaping and as a cut flower (VIÉGAS et al, 2012; LESSA et al, 2015)
Rhizomes are rich in phenolic compounds with antioxidant and antibacterial properties, which can be used as a natural preservative in the food industry (SIVASOTHY et al, 2012a; 2013)
The presence of seed is not reported for most areas of Z. spectabile cultivation
Summary
As an attractive tropical ornamental plant, Zingiber spectabile (Zingiberaceae) is widely cultivated in Brazil due its high commercial value. This species is known as beehive ginger or ornamental ginger, and is used for landscaping and as a cut flower (VIÉGAS et al, 2012; LESSA et al, 2015). Rhizomes are rich in phenolic compounds with antioxidant and antibacterial properties, which can be used as a natural preservative in the food industry (SIVASOTHY et al, 2012a; 2013). Zerumbone is the most abundant component in the rhizome, which has been found to possess multiple biomedical properties, such as antiproliferative, antioxidant, anti-inflammatory, and anticancer activities (SIVASOTHY et al 2012a; RAHMAN et al 2014). A dimeric flavonol glycoside (Spectaflavoside A), a potent iron chelating agent, is found in Z. spectabile rhizomes (SIVASOTHY et al, 2012b)
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